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authorMichael Ellerman <michael@ellerman.id.au>2006-12-05 17:52:38 +1100
committerPaul Mackerras <paulus@samba.org>2006-12-08 15:55:55 +1100
commit674fa677c01ad0b90237f5cddc8d68502fea5156 (patch)
tree266926fa89dbe8b854cc552ffc512fe97bdb0361 /arch/powerpc/platforms/pseries/hotplug-cpu.c
parent413f7c405a342b0b9370ea7a652b9f0270183bf3 (diff)
downloadlinaro-lsk-674fa677c01ad0b90237f5cddc8d68502fea5156.tar.gz
[POWERPC] Only enable cpu hotplug via RTAS if the required firmware support is found
To support cpu hotplug on pseries we require two RTAS tokens. The cpu hotplug machinery should only be wired up if these tokens are found in the device tree. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/hotplug-cpu.c')
-rw-r--r--arch/powerpc/platforms/pseries/hotplug-cpu.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 12864d75126..e78e8ac9555 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -64,6 +64,8 @@ static void pSeries_mach_cpu_die(void)
for(;;);
}
+static int qcss_tok; /* query-cpu-stopped-state token */
+
/* Get state of physical CPU.
* Return codes:
* 0 - The processor is in the RTAS stopped state
@@ -74,12 +76,8 @@ static void pSeries_mach_cpu_die(void)
*/
static int query_cpu_stopped(unsigned int pcpu)
{
- int cpu_status;
- int status, qcss_tok;
+ int cpu_status, status;
- qcss_tok = rtas_token("query-cpu-stopped-state");
- if (qcss_tok == RTAS_UNKNOWN_SERVICE)
- return -1;
status = rtas_call(qcss_tok, 1, 2, &cpu_status, pcpu);
if (status != 0) {
printk(KERN_ERR
@@ -254,9 +252,16 @@ static struct notifier_block pSeries_smp_nb = {
static int __init pseries_cpu_hotplug_init(void)
{
rtas_stop_self_args.token = rtas_token("stop-self");
+ qcss_tok = rtas_token("query-cpu-stopped-state");
- ppc_md.cpu_die = pSeries_mach_cpu_die;
+ if (rtas_stop_self_args.token == RTAS_UNKNOWN_SERVICE ||
+ qcss_tok == RTAS_UNKNOWN_SERVICE) {
+ printk(KERN_INFO "CPU Hotplug not supported by firmware "
+ "- disabling.\n");
+ return 0;
+ }
+ ppc_md.cpu_die = pSeries_mach_cpu_die;
smp_ops->cpu_disable = pSeries_cpu_disable;
smp_ops->cpu_die = pSeries_cpu_die;